#title{
    color:red
}
#box1{
    width:500px;
    height:500px;
    background: url(../img/1.jpg) no-repeat;
    display: flex;

}
#box2{
    width:100%;
    height:1080px;
    background: url(../img/2.jpg) no-repeat center top;
    display: flex;
}

#box3{
    width:100%;
    height:1080px;
    background: url(../img/2.jpg) no-repeat center top;
    display: flex;
}